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Auto merge of #155385 - davidtwco:stdarch-sync-160426, r=davidtwco
stdarch subtree update
Subtree update of `stdarch` to https://github.com/rust-lang/stdarch/commit/095646219d35769f013c4a54d843a982c87d979c.
Created using https://github.com/rust-lang/josh-sync.
r? @ghost
